Silage pile defacer

ABSTRACT

A silage pile defacer includes a frame having a rear end and a front end. A transverse beam carrying a plurality of downwardly projecting tines is coupled to the front end of the frame. A quick connect coupler is mounted to the rear end of the frame for mounting the defacer to a quick hitch coupler on the lift arm mechanism of a tractor. The tines are oriented at an angle relative to the frame, allowing the tines to be generally vertically oriented relative to the ground when the defacer is elevated above a silage pile. The tines of the defacer are configured to contact the silage pile and to skive off a face layer of the silage pile when the defacer is lowered to the ground by the tractor lift arm mechanism.

CROSS-REFERENCE TO RELATED APPLICATION

This is a continuation-in-part of U.S. patent application Ser. No.11/818,371, filed Jun. 14, 2007, now U.S. Pat. No. 7,588,203.

BACKGROUND

The present invention generally relates to silage pile defacers. Silageis typically stored on the ground in a large pile. The silage pile isusually covered with a plastic sheet to minimize air and moistureexposure to the pile, which prevents spoilage of the silage. One end ofthe pile is uncovered for removal of a daily feeding volume of silage. Agenerally vertical layer of silage is removed from the exposed face ofthe pile to form a feed pile at the base of the silage pile. Typically,a front end loader or similar implement is employed to scoop up the feedpile for delivery to livestock.

Known silage pile defacers comprise a hydraulically actuated rotatingcylinder with radially extending teeth carried on a tractor-mountedimplement. The implement is maneuvered to draw the rotating cylinderalong a vertical face of the silage pile to remove a layer of thesilage. The known silage pile defacers necessitate frequent maintenanceto repair/replace worn parts. The teeth of the rotating cylinder of theknown silage pile defacers also grind the silage as it removes thesilage from the pile, which creates silage “fines.” Excess silage finesare undesirable in feed for dairy cows.

The present invention provides an improved silage pile defacer with nomoving parts that does not grind the silage.

SUMMARY

A silage pile defacer comprises a frame having a first end and a secondend opposite the first end and a longitudinal axis. The first end of theframe comprises means to reversible couple the frame with a quickconnect lift arm mechanism of a tractor. A transverse beam is coupled tothe second end of the frame. The transverse beam has a length, a frontsurface, an upper surface and a lower surface. A plurality of tines arespaced along the length of the transverse beam and coupled to extendaway from the lower surface of the transverse beam. Each of theplurality; of tines comprises an edge surface oriented at an angle otherthan 90 degrees relative to the longitudinal axis of the frame.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of one embodiment of a silage pile defacerof the present invention mounted on a tractor and positioned above asilage pile;

FIG. 2 is a side perspective view of one embodiment of the silage piledefacer of the present invention;

FIG. 3A is a partial side view of a front end of the silage pile defacerof FIG. 2;

FIG. 3B is a cross-sectional view of a portion of a transverse beam anda tine coupled to the transverse beam taken along line 3B-3B of FIG. 2;

FIG. 4 is a partial side view of a front end of a second embodiment of asilage pile defacer of the present invention;

FIG. 5 is an exploded partial perspective view of a front end of a thirdembodiment of a silage pile defacer of the present invention;

FIG. 6 is a side view of the silage pile defacer shown in FIG. 2 restingon the ground and ready for attachment to an implement; and

FIG. 7 is a perspective view of the silage pile defacer assembly shownin FIG. 1 defacing a layer of silage from the silage pile.

FIG. 8 is a perspective view of a fourth embodiment of a silage piledefacer of the present invention.

FIG. 8A is a side view of the transverse beam and tine configuration ofthe defacer of FIG. 8.

DETAILED DESCRIPTION

FIG. 1 is a perspective view of a silage pile defacer assembly 10positioned to remove a layer of silage from a silage pile 12 accordingto one embodiment. Assembly 10 generally includes a silage pile defacer14 coupled to a lift arm mechanism 19 of a tractor 16. Tractor 16 isemployed to elevate defacer 14 above a top side 18 of the silage pile12. Through the coordinated movement of a lifting arm mechanism 19 oftractor 16, defacer 14 is able to remove a generally vertical layer ofsilage from a face of pile 12.

FIG. 2 is a side perspective view of one embodiment of the silage piledefacer 14 of the present invention. Silage pile defacer 14 generallyincludes a frame 22 having a rear end 24 and a front end 26, a quickattach mount 28 coupled to rear end 24, and a transverse beam assembly30 coupled to front end 26 of frame 22. Transverse beam assembly 30includes a plurality of tines 32 spaced along the length of beamassembly 30, which extend generally downward from transverse beamassembly 30. When defacer 14 is disconnected from tractor 16, transversebeam assembly 30 is supported above the ground by a base 34 connected toa lower surface of frame 22. Silage pile defacer 14 is generallyfabricated from metal, e.g., steel, suited for use with powered farmimplements.

In one exemplary embodiment, frame 22 includes a first elongate metalbeam 40, a second elongate metal beam 42 that is spaced from andgenerally parallel to first beam 40 and a plurality of lateral braces 44spaced relative to on another and coupled between facing outer surfacesof first and second beams 40, 42. By way of example, in one embodimentmetal beams 40 and 42 each have a length of about 17 feet and are spacedapart by about 29 inches. The number and placement of lateral braces 44may vary depending upon a selected overall length of defacer 14. In oneembodiment, three lateral braces 44 are generally equally spaced apartbetween rear end 24 and front end 26 and are secured to beams 40 and 42by welding. Each beam 40, 42 has a front end surface at front end 26. Inone embodiment, front ends 26 are formed at an acute angle C as measuredfrom upper surface 41 of beams 40, 42. Alternatively, front ends 26 maybe formed at an angle selected from a range that is greater than or lessthan 90 degrees relative to the upper surface 41 of beams 40, 42. Eachbeam 40, 42 further has a rear end surface at rear end 24. In oneembodiment, rear ends 24 are formed at an obtuse angle B as measuredfrom upper surface 41 of beams 40, 42. In one embodiment, the angle B isan obtuse angle between about 95-150 degrees, and preferably the angle Bis between about 110-135 degrees. In one embodiment, the angle C is anacute angle between about 40-85 degrees, and preferably the angle C isbetween about 65-75 degrees.

In one embodiment, connected to each rear end surface of beams 40, 42 isa metal plate 46, which provides a mounting surface for quick attachmount 28. Metal plate 46 is a generally rectangular plate having aheight and width greater than that of the rear end surface of beams 40,42. In one embodiment, plates 46 are secured to beams 40, 42 by welding.Top and bottom portions of plates 46 are reinforced by wedge-shapedmetal gussets 48 that are welded to beams 40, 42 and plates 46.

In general, quick attach mount 28 includes a first hanger 50 and asecond hanger 52. First and second hangers 50, 52 each comprise a metalplate 54 having a straight front edge 56 that abuts plate 46 and a rearedge configured to define a hook 58 at an upper extent of plate 54 andan eye 60 spaced from and below hook 58. Hooks 58 and eyes 60 of metalplates 54 cooperate with a quick hitch coupler provided on a liftmechanism of a tractor, front end loader, or the like. Each plate 54includes mounting flanges 62 on opposite sides adjacent to front edge56. Flanges 62 comprise a length of angle iron having one leg 64 weldedto plate 54 and the adjoining leg 66 flush with front edge 56. Hangers50, 52 are secured to metal plates 46 by welding or bolting flanges 66to plates 46. In one embodiment, hangers 50, 52 are braced together by abrace 65 connected between lower edges of plates 54.

In one embodiment, transverse beam assembly 30 includes an uppertransverse beam member 70 that defines an upper surface 72 of transversebeam 30, and a lower transverse beam member 74 spaced from beam member70 that defines a lower surface 76 of transverse beam 30. Transversebeam assembly 30 has a length substantially greater than the width offrame 22, with beam assembly 30 being generally centered relative to alongitudinal axis A of frame 22. In one embodiment, transverse beamassembly 30 has a length of about 10 feet. Rear facing surfaces 78 oftransverse beams 70, 72 are connected to the front end surfaces of beams40, 42, e.g. by welding. End portions of transverse beam members 70, 74are connected by end plates 79 welded to beams 70, 74.

Tines 32 are located along and connected to transverse beam member 74 ina spaced relationship relative to one another. In one embodiment, tines32 have a spacing of about 15 inches on center. Tines 32 extend fromlower surface 76 in a, generally downward direction. In one embodiment,tines 32 are solid steel bale tines having a length of about 32 inchesand an outer diameter of about 1 inch.

FIG. 3A is a partial side view of front end 26 of the silage piledefacer 14 of FIG. 2 with end plate 79 removed. In general, tines 32extend away from lower surface 76 of transverse beam member 74 generallyperpendicular to lower surface 76. Relative to beams 40, 42, tinesextend at the acute angle C as shown, in a direction toward the rear end24 of frame 22.

FIG. 3B is a cross-sectional view of a portion of transverse beam member74 and tine 32 taken along line 3B-3B of FIG. 2. In one embodiment,second transverse beam member 74 is a box beam having four wallsdefining sides 84. Upper surface 85 and lower surface 76 of beam member74 are provided with pairs of openings in which is secured a sleeve 86,such as by welding. The opening in lower surface 76 is larger than theopening in upper surface 85. Sleeve 86 has a first portion 87 extendingfrom lower surface 76 defined by a radially tapered inner diameter and asecond portion 89 which extends to upper surface 85 at a constant innerdiameter defined relative to the opening in upper surface 85. Sleeve 86is configured to receive an end 88 of tine 32 having an outer surface 90configured complimentary to the inner diameter of portions 87, 89 ofsleeve 86. An end portion 92 of tine 32 is machined with externalthreads. Tine 32 is connected to beam 25 member 74 by inserting tine 32into sleeve 86 until the relative surfaces of tine 32 and sleeve 36 mateand an end portion 92 of tine 32 extends beyond upper surface 85 of beammember 74. Tine 32 is retained within sleeve 36 by a nut 93 threadedonto end portion 92 of tine 32. In this manner, tine 32 is securelybolted to transverse beam member 74, but is removable for maintenanceand/or replacement.

FIG. 4 is a partial side view of a front end of a second embodiment of asilage pile defacer 14 of the present invention. As shown in FIG. 4, afront surface 96 of beam 40 is generally perpendicular to upper surface41 of beam 40. Transverse beam assembly 30 is connected to front surface96. A sleeve similar to sleeve 86 is inserted and connected betweenopenings located generally near opposite corners of beam member 74 at anacute angle C to permit tines 32 to extend away from lower surface 66 oftransverse beam 30 at the acute angle C as measured from thelongitudinal axis A of beam 40. In one embodiment, tines 32 are insertedinto a sleeve formed in transverse beam member 74 in a manner similar tothat described in FIG. 3B above. Alternatively, tines 32 are welded totransverse beam member 64.

FIG. 5 is a side view of the silage pile defacer 14 shown in FIG. 2resting on the ground G. Quick attach mount 28 and base 34 contactground G, and tines 32 are elevated off of the ground G. Base 34 iscoupled to frame 22 between a center of mass M of defacer 14 and frontend 26, such that quick attach mount 28 is imbalanced to naturally tiltto the ground G.

Quick attach mount 28 is coupled to rear end 24 of frame 22 at angle B,and tines 32 and transverse beam 30 at the angle C. The angle B isdifferent from the angle C and is selected to facilitate hitching aquick hitch coupler of a tractor lift arm mechanism to an at rest quickattach mount 28. One suitable example provides an angle B of about 110degrees. The angle C can vary depending, upon the size of the silagepile 12 and/or the size of the tractor 16 employed to lift defacer 14.One suitable example provides an angle C of about 80 degrees. The anglesB and C are selected to orient tines 32 to be generally perpendicular tothe ground when front end 26 of defacer 14 is elevated above the topsurface 18 of the silage pile 12 (FIG. 1).

FIG. 6 is a perspective view of defacer 14 coupled to a hydraulicallyactuated lift arm mechanism 19 of a tractor 16. To deface a layer ofsilage from silage pile 12, tractor 16 is maneuvered with defacer 14oriented generally perpendicular to face 98 of silage pile 12. Lift armmechanism 19 is then actuated to elevate defacer 14 above silage pile 12with tines 32 generally perpendicular to the ground. Tines arepositioned to contacts silage pile 12 about 1 foot away from face 98.The lift arm mechanism 19 is then actuated to lower defacer 14 towardthe ground with tines 32 thus skiving a layer of silage from the face 98of pile 12. Tractor 16 is then repositioned along face 98 to the nextadjacent portion of silage pile 12 to skive the next adjacent layer ofsilage from pile 12.

Tines 32 extend away from transverse beam 30 at the angle C (FIG. 3A),such that when silage pile defacer 14 is elevated above the silage pile12, tines 32 are oriented generally vertically to the ground andconfigured to engage with the top 18 of pile 12. An operator of tractor16 having an ordinary level of skill in operating farm equipment is ableto operate lift arm mechanism 19 to rake tines 32 downward along a face98 of the silage pile 12 to form a mound 99 of silage feed. The mound 99of feed is formed by a suitable number of swipes of silage pile defacer14 along face 98, after which the silage feed is transported to afeeding trough or other area.

The silage in pile 12 is densely packed due to the pile 12 settlingunder the force of gravity over the course of weeks or months. Thecombination of angles B and C of support strut 22 (FIG. 2) enableassembly 10 to skive a near vertical face 214 on silage pile 12.Alternatively, assembly 10 is operable to skive an inclined face on thesilage pile 12, depending upon the operator's manipulation of lift armmechanism 19. However, a more vertical face 98 is generally desired tominimize erosion of the pile 12.

FIG. 7 is an exploded perspective view of a third embodiment of silagepile defacer 100 comprising a frame 102 and an adjustable angletransverse beam 104 mounted to frame 102 by a hinge assembly 106according to one embodiment. Embodiments provide for selectively tiltingtransverse beam 104 relative to frame 102 via hinge assembly 106 toachieve a desired angle of tines 32 relative to frame 102. Theadjustability provided by hinge assembly 106 enables the selectiveangular positioning of tines 32 to accommodate various sizes of tractorsused to lift defacer 100.

In general, the rear end of frame 1.02 is similar to rear end 24 offrame 22 (FIG. 2); and includes a quick attach mount (not shown, butsimilar to quick attach mount 28 of FIG. 2). Front end 110 of frame 102includes a hinge mounting plate 108 that is coupled to the angled frontfacing surfaces of beams 112, 114 of frame 102, which are formed at anangle D relative to upper surface 113 of beams 112. 114. In oneembodiment, hinge mounting plate 108 is welded to the front facingsurfaces of beams 112, 114 and a gusset 120 is welded between each beam112, 114 and top end 118 of hinge mounting plate 108. The angle Ddefines the largest incline for transverse beam 104 (i.e., the greatestamount of angled rake for tines 32 relative to axis A). An exemplaryrange for the angle D suited to accommodate most tractors to whichdefacer 100 is attached is between about 20-50 degrees. Mounted at a topend of hinge mounting plate 108 are spaced hinge sleeves 116.

Transverse beam 104 includes an upper transverse beam member 130 thatdefines an upper surface 132 of transverse beam 104, and a lowertransverse beam member 134 that defines a lower surface 136 oftransverse beam 104. Tines 32 extend from the lower transverse beammember 134 in the manner previously described relative to transversebeam 30.

With the above in mind, hinge assembly 106 includes a pair of hubs 140coupled to upper transverse beam member 130 that rotatably engage withsleeves 116 of hinge mounting plate 108. Sleeves 116 and hubs 140 eachdefine bores 142, 144, respectively, and are configured to receive anaxel 146 that is insertable through bores 142, 144. The number ofsleeves 116 and hubs 140 is not critical and can vary depending upon alength of transverse beam 104. For example, two hubs 140 are providedthat mesh with three sleeves 116 (as shown), but other embodiments caninclude three hubs 140 that mesh with four loops 116, for example.

When hinge assembly 106 is operably coupled, axel 146 is insertedthrough bores 142, 144 to enable hubs 140 to rotate relative to sleeves116. In this manner, transverse beam 104 is configured to adjustablyrotate relative to frame 102 such that tines 32 are rotatable through arange of angles from about 90 degrees, where tines 32 are substantiallyperpendicular to frame 102, to the acute angle D. Means are provided toselectively fix the adjustable transverse beam 104 relative to frame 102when the desired angle of transverse beam 104 is achieved.

In one embodiment, transverse beam 104 includes a first arm 150 spacedfrom a second arm 152, where arms 150, 152 are coupled to uppertransverse beam member 134 and configured to engage with frame 102. Inone embodiment, a corner support 154 is welded between upper transversebeam member 134 and each arm 150, 152. In general, arms 150, 152 arespaced apart by a distance that enables arms 150, 152 to straddle secondend 110 of frame 102. In this manner, when assembled, transverse beam104 rotates relative to frame 102 about hinge assembly 106, and arms150, 152 slide along outward facing sides of beams 112, 114.

Arms 150, 152 are fabricated to include an indexed series of holes 160including a first hole 162 spaced from a last hole 164. Beams 112, 114are provided with bores 170 near front end 110. Holes 160 of each arm150, 152 align with bores 170 formed in a lateral side of beams 112,114, which allows tines 32 to extend at an angle ranging from about 90degrees relative to central longitudinal axis A to the angle D.

A pin 172 is provided that is configured to engage with one of theindexed holes 160 and bore 170 to selectively retain transverse beam 104(and tines 32) at the desired angle relative to axis A. Pin 172 includesspring-loaded pins, or pins configured to receive a cotter pin, or otherpins suitably styled to retain arms 150, 152 in a desired positionagainst beams 112, 114, respectively.

In general, the angle D is an acute angle selected to be in the range ofabout 20-50 degrees, preferably the angle. D is about 35 degrees. Forlarger tractors and large silage piles (of over about 20 feet in height,for example), arms 150, 152 are pinned relative to frame 102 such thatfirst hole 162 is aligned with bore 170 and tines 32 extend at an angleapproaching about 90 degrees to central longitudinal axis A. Conversely,for smaller tractors such as skid steers, arms 150, 152 are pinnedrelative to frame 102 such that last hole 164 is aligned with bore 170and tines 32 extend at the steepest angle, which is about at the angleD. In this manner, both large and small tractor sizes are accommodatedby the adjustable transverse beam 104 that enable tines 32 to besubstantially perpendicular to a top of a silage pile when the defacer100 is elevated above the silage pile, regardless of tractor or silagepile size.

FIG. 8 is perspective view of a fourth embodiment of a silage piledefacer 200 of the present invention. Defacer 200 is similar in generalconstruction to defacer 14. Defacer 200 generally includes a frame 222having a rear end 224 and a front end 226, a quick attach mount 228coupled to rear end 224, and a transverse beam 230 coupled to front end226 of frame 222. Transverse beam 230 includes a plurality of tines 232spaced along the length of beam 230, which extend generally downwardfrom transverse beam 230. When the defacer 200 is not in use thetransverse beam assembly 230 is supported above the ground by a base 234connected to a lower surface of frame 222.

Frame 222 includes a first elongate metal beam 240, a second elongatemetal beam 242 that is spaced from and generally parallel to first beam240 and a plurality of lateral braces 244 spaced relative to one anotherand coupled between facing outer surfaces of first and second beams 240,242. Other suitable constructions for frame 222 are also acceptable,including frames having a single elongate metal beam and frames havingmore than two elongate metal beams. As shown in FIG. 8, each beam 240,242 has a greater width at rear end 224 as compared front end 226, thewidth of each beam tapering from rear end 224 generally to the point ofattachment of base 234

Attached to the rear end 224 of each beam 240, 242 are hangers 250, 252,respectively, which are similar in construction to hangers 50, 52 of theembodiment shown in FIG. 1. Each hanger 250, 252 is configured with ahook 251 having a first spacing from rear end 224, and an eye 253 havinga second spacing, greater than the first spacing, relative to rear end224. The spacing differential between hooks 251 and eyes 253 defines anobtuse angular configuration of hangers 250, 252 at rear end 224 thatfacilitates connection to a quick hitch coupler of a tractor lift armmechanism without having to form the rear ends 224 of beams 240, 242 atan obtuse angle as disclosed relative to defacer 14. Hangers 250, 252each have a, length generally equal to the width of beams 240, 242 atrear end 224 such that hangers 250, 252 are supported completely on theend surfaces of beams 240, 242.

As further shown in FIG. 8, in one embodiment, braces 231 are connected,e.g., by welding, between the ends of transverse beam 230 and beams 240,242 to provide additional support for transverse beam 230. As shown inFIGS. 8 and 8A, unlike defacer 14 of FIG. 2, the front end surface 241of elongate beam 240 is formed at an angle of about 90 degrees relativeto axis A of beam 240 (beam 242 being similarly configured). Transversebeam 230 is connected to the respective front end surfaces of beams 240,242 by welding. Tines 232 are each comprised of a planar metal platehaving a generally linear front edge 260 and generally linear rear edge262 which extends from an end 261 of front edge 260 at an angle relativeto front edge 260. An upper portion of the metal plate forming each tine232 is configured with edge portions 264 and 266 that are complimentaryto and mate with the lower and rear surfaces 268, 270, respectively oftransverse beam 230. Tines 232 are connected to transverse beam 230along edge portions 264 and 266 by welding. As shown, the front edge 260of each tine 232 is generally aligned and parallel with the frontsurface 272 of transverse beam 230 and perpendicular to axis A of beams240, 242, although this alignment is not critical and other orientationsof front edge 260 may employed. The rear edge 262 extends at an anglerelative to front surface 272, e.g., an angle of less than 90 degrees.Relative to axis A of beam 240, the rear edge 262 extends at an obtuseangle. In one embodiment, rear edge 262 extends at an angle of about 45degrees relative to front surface 272. As such, tines 232 of transversebeam 230 collectively provide a wedge-like function to move a layer ofsilage away from the silage pile when the front end 226 of defacer 20 ismaneuvered down the exposed face of a silage pile with the tinesgenerally vertically oriented and engaging the silage pile.

Embodiments described above provide an easy to maintain silage piledefacer having no moving parts which does not degrade the silage in theprocess of remove a face layer of silage. The silage pile defacerincludes a quick attach mount compatible with quick hitch couplers usedby farmland other implements. The quick attach mount of the silage piledefacer is configured to rest on the ground when the defacer is not isuse in a manner that, elevates tines of the defacer off of the ground.

Although specific embodiments have been illustrated and described itwill be appreciated by those of ordinary skill in the art that a varietyof alternative and/or equivalent implementations may be substituted forthe specific embodiments shown and/or described without departing fromthe scope of the present invention. This application is intended tocover any adaptations or variations of the specific exemplaryembodiments of the above-described silage pile deface. Therefore, it isintended that this invention be limited only by the claims andequivalents of the claims.

1. A silage pile defacer comprising: a frame having a first end and asecond end opposite the first end, the first end of the frame comprisingmeans to reversible couple the frame with a quick connect lift armmechanism of a tractor, the frame having a longitudinal axis; atransverse beam coupled to the second end of the frame, the transversebeam having a length, a front surface, an upper surface and a lowersurface; and a plurality of tines spaced along the length of thetransverse beam and coupled thereto to extend away from the lowersurface of the transverse beam, each of the plurality of tinescomprising an edge surface oriented at an angle other than 90 degreesrelative to the longitudinal axis of the frame.
 2. The silage piledefacer of claim 1, wherein the frame comprises: a first elongate beamhaving an upper surface and a front end surface; a second elongate beamspaced from and generally parallel to the first beam, the secondelongate beam having an upper surface and a front end surface; and aplurality of lateral braces coupled between the first and second beams;wherein the front end surface of each of the first and second beamsdefines the second end of the frame.
 3. The silage pile defacer of claim1 wherein the edge surface of each of the plurality of tines is orientedat an acute angle relative to the longitudinal axis of the frame.
 4. Thesilage pile defacer of claim 1 wherein the edge surface of each of theplurality of tines is oriented at an obtuse angle relative to thelongitudinal axis of the frame.
 5. The silage pile defacer of claim 4wherein each tine comprises a metal plate having an upper portionconnected to the transverse beam and a lower portion, the lower portioncomprising a front edge generally aligned with and parallel to the frontsurface of the transverse beam and a rear edge extending at an anglerelative to the front edge, the rear edge comprising the edge surface.6. A silage pile defacer comprising: a frame having a first end and asecond end opposite the first end and a longitudinal axis, the first endof the frame comprising means to reversible couple the frame with a liftarm mechanism of a tractor; a transverse beam coupled to the second endof the frame, the transverse beam having a length, a front surface, arear surface, an upper surface and a lower surface; and a plurality oftines spaced along the length of the transverse beam and coupled toextend away from the lower surface of the transverse beam, each of theplurality of tines comprising a metal plate configured to define a frontedge generally perpendicular to the longitudinal axis of the frame and arear edge extending from the front edge at an angle.
 7. The silage piledefacer of claim 6 wherein the rear edge of the metal plate extends atan angle of less than 90 degrees relative to the front edge.
 8. Thesilage pile defacer of claim 6 wherein the rear edge of the metal plateextends at an angle of about 45 degrees relative to the front edge.